采矿专业外文翻译--埃达克岩与斑岩铜矿(编辑修改稿)

采矿专业外文翻译--埃达克岩与斑岩铜矿(编辑修改稿)内容摘要：

rsky, Island Adakites . (3) has been the demise of the partial melting of subducted slab: AridHills, Jaraquay Adakites . (4) old oceanic crust in subduction occurred in the beginning part of the melt:The Philippines Mindandao the eastern Adakites . (5) partial melting of basalt underplating: such as western Ethiopia The Birbir plex . (6) flat subduction angle of partial melting of oceanic crust: such as Peru and Ecuador Adakites . (7) of the lower crust delamination: the word39。 s eastern Adakite Rock . 2 Adakite and porphyry copper 6 Adakites and mineralization Past studies have found that the causes of some of the subducted slab melting Adakite Au and Cu, Ag, Mo shallow epithermal deposits and porphyry copper deposits are closely associated, they believe that these deposits into minerals from angstrom NASDAQ magma . (1) mantle and mafic rocks of Au, Cu, Ag, Mo element abundance value is high, due to the formation of Adakites and crustmantle exchange about , therefore, in the Edda grams of rock formation process, the metal element and the role of lower crust and mantle exchange from melting and enrichment and mineralization in the late favorable geological and physicochemical conditions. (2) experimental studies have shown that adakitic magma formation requires a high temperature (850 176。 C 1100 176。 C) [36 37] and pressure (1 2 4 0Gpa), [ Adakitic magma formation process, due to the amphibolite facies transformation of eclogite facies and the release of large amounts of water Higher temperature and pressure, in particular, is rich in water, very conducive to the magmatic (hydrothermal) the extraction of metal elements, and enrichment and mineralization under appropriate conditions . (3) under high temperature, high pressure, waterrich and high fo2 state, the S magma exist to S6 + form, S2 small, this situation easily lead sulfide in the magma is unsaturated. Oxidation state, the crystallization of saturated magma differentiation role of oreforming elements bee inpatible element enrichment in the magma, rich in Cu and Au, Ag magmatic hydrothermal final release。 Conversely, if the sulfide saturation bee patible elements remain in the residual phase . For these reasons, every reason to believe that Adakite is a very favorable mineralization host rock, especially on the porphyrytype Cu ore and epithermal type of Cu Au deposit. But must be noted that: Adakites in the formation of certain metal deposits, but does not mean that there the Adakite we will be able mineralization, deposit formation in addition to magmatic conditions, but also need the appropriate structure and physicochemical conditions, such as ancillary. The matching conditions are bad, difficult to form deposits. Bonnemaison et al (1990) On this basis, the goldbearing shear zone is divided into early, middle and late three types. Which have economic significance of the main shear zone type gold deposits in the late stages of the shear zone is closely related. Early stage in the late stage of the further activation of the initial concentration of gold transferred to the 7 favorable space sedimentary mineralization. Shear zone in the late formation temperature, and the deformation behavior is a result of expansion with the formation of gold deposits in a favorable stage. By early and middle stage is marked by pyrrhotite, pyrite, marcasite replacement (high to low conversion), sugar, granular quartz occur, and veins and stockworklike structure growth (ductile to brittle toughness conversion) and so on. In the usual sense of the late shea。